PROBLEM SET 10

PROBLEM SET 10 - ELECTROCHEMISTRY Redox reactions A redox...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
MSE 110 - University of Arizona Redox reactions ELECTROCHEMISTRY 2 Fe + 3 / 2 O 2 Æ Fe 2 O 3 •A redox reactions involves the transfer of electron from the reductant to the oxidant . n oxidation and a reduction must happen simultaneously. Fe Æ Fe 3+ + 3 e - O 2 + 4e - Æ 2 O 2- oxidation Reduction Cu 2+ + Zn Æ Zn 2+ + Cu Cu 2+ + 2 e - Æ Cu Zn Æ Zn 2+ + 2 e - + ++
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MSE 110 - University of Arizona Redox Knowledge Block •A n oxidation correspond to a loss of electrons Fe Æ Fe 3+ + 3 e - reduction correspond to a gain of electrons O 2 + 4e - Æ 2 O 2- •T h e standard redox potential E o quantifies the relative ability of each redox couple to give or take electrons. • High E o : strong oxidant. •L o w E o : strong reductant •I n a n electrochemical cell , the potential difference (voltage) between the two electrodes is Δ E o =E o Ox -E o Red . E o Ox is the standard potential of the oxidant E o Red is the standard potential of the reductant • A reaction takes place only if E o Ox >E o Red and therefore Δ E o >0 Δ E o is a measure of the driving force of the reaction and is related to Δ G according to Δ G = -nF Δ E o .
Background image of page 2
MSE 110 - University of Arizona Problem 1 which of the following redox couple is the strongest reductant?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/06/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at Arizona.

Page1 / 15

PROBLEM SET 10 - ELECTROCHEMISTRY Redox reactions A redox...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online